Free
range egg laying hens enjoy the benefits of an outdoor life with
sunlight to keep them healthy. When deprived of natural sunlight, a vitamin D deficiency often results in bone density problems .
The
average broiler chicken lives 6–8 weeks and spends all
of
that time indoors. It has been found that optimum weight gain in
broiler hens occurs with 16 hours of lighting and 8 hours of
darkness. This
forced growth often creates health issues. Among other things,
weight-gain can exceed skeletal development.
Researchers at Auburn University in Alabama are investigating the use
of natural light in broiler houses and its effects on bird
performance and welfare. A team of agricultural engineers, animal
scientists and Extension specialists at the Alabama Agricultural
Experiment Station was awarded $300,000 by the USDA National
Institute of Food and Agriculture to study the impact natural light
will have on commercial broiler flocks’ growth and welfare. The
team says it will also develop a method for measuring the environmental
impact of using more natural light compared with artificial light in
sheds.